Even more amazing is the lack of televised games, even in the late sixties.
During the 1968 National Championship season, the Buckeyes were on ABC for Northwestern and NBC for the Rose Bowl. No other games were televised which is why I listened to the TTUN thrashing on the radio in my dorm room in Cleveland.
The next year it was two games again, back to back games against Purdue and TTUN were on ABC. There was no bowl game that year and wouldn't have been even if they had beaten TTUN.
1984 was the first season with more than four games televised.